Multiplying device



Sept. 5, 1950 M. sl-:Ns-oLlvE 2,521,418

MULTIPLYING DEVICE Filled Feb. 25, 1948 9 Sheets-Sheet' V1 Tens 7 52v08530 vThousands 2 l2 'J- 4 f 6 ATTORNEY Sept. 5, 1950 M. SENS-'OLIVE 2,521,418

MULTIPLYING DEVICE Filed Feb. 25, 1948 9 Sheets-Sheet 2 v Ir-: lio- E KDO:

x2 MULTIPLE BY fam? v ATTORNEY Sept. 5, 1950 M.v SENS-OLIVE MULTIPLYING DEVICE 9 Sheets-Sheet 5 Filed Feb. 25, 1948 5 MULTIPLE BY ATTORNEY M. SENS-OLIVE 2,521,V41J8 MULTIPLYING DEVICE Sept. 5, y1950 9 shets-sheet 4 Filed Feb. 25, 1948 X4 MULTIPLE y: i E. Eb-

INVENTOR 4Z mfc@ SMQ-@Uff BY f MM, D@ ATTORNEY Sept 5, 1950 M. SENS-OLIVE 2,521,418

MULTIPLYING DEVICE Filed Feb. 25, 1948 9 Sheets-Sheet 5 Sept. 5, 195.0 l M. sENs-oLlvl-:- 2,521,418

MULTIPLYING DEVICE Filed Feb. 25, 1948 v 9 sheets-sheet e I l Units` v MMULTIPLE.

Sept. 5, 1950 M. sENs-oLlvE MULTIPLYING DEVICE vFiled Feb.`25, 1948 9 vSheel',js-Sheet. '7

S5 s4 55 52 s1 x8 MULTIPLE ,6,

v MMC@ Savs- OUI/f 4Z j f' BY M ATTORNEY Sept. 5, l1950 M. SENS-OLIVE .2,521,418

MULTIPLYING DEVICE Filed Feb. 25, 1948 9 Sheets-Sheet 8 4 s6 /5 S5 s4 5 l E e' INVENTR 42 Sept. 5, 1950 M. s'x-:Ns-oLlv .2,521,418

I MULTIPLYING DEVICE Filed Feb. 25, 1948 9 SheetS-Sheet 9 I a co oc/ 5 :406 57 o X9 MULTIPLE ATTORNEY Patented Sept. 5, 1950 MULTIPLYING DEVICE- Marcel Sens-Olive, Paris, France, assignor to International Business Machines Corporation, New York, N. Y., a corporation of New York Application February 25, 1948, Serial No. 10,635 In France May 11, 1943 Section 1, Public Law 690, August 8, 1946 Patentexpires May 11, 1963 4 Claims.

The present inventionl relates tor improvev ments in calculating machines and more particularly to multiplying and dividing machines.

In certain types of multiplying machines, vthe multiples of 1 `to 9 times the multiplicand are computed and set up, andl these are selectively entered into an accumulating device in succes sion in accordance with digits of a multiplier to obtain the product, provision being made for appropriate denominational allocation of the multiples.

Also in certain types of dividing machine, the multiples of 1 to 9 times the divisor are cornputed and set up, and these are compared with a dividend to ascertain which is the highest multiple that is less than such dividend.

The principal object of the present invention is to provide a simple apparatus in which a setting may be made representative of a multidenominational amount and in which such setting will effect an adjustment of a computing network from which any or all'of the multiples of 1 to 9 times the amount -can-be directly read out.

In multiplying any multidenominational number by a single digit, the product is obtained by forming a series of subproducts `representing the 675, namely, the sum of l5, 21 and 18as above but Without the tens carry from the hundreds to the thousands-order. Prior to such reading out, however, the network is tested to ascertain where tens carries are required, and the `network is thereupon readjusted to increase the readout digit values accordingly. Thus, in the thousands order of the product for the example 3 times 675, the readjustment will cause a 2 to be read out instead of the initial 1.

It may be said, therefore, that the initialsetting of the network provides circuit paths to .po-

' tentially read out the product of an amount .times 3 7=21, and 3 6=18. These are then summed up as follows:

units tens hundreds resulting in the product 2025.

Each subproduct, such as 15, has a right hand component (as 5) and a left hand component (as l). In adding the subproducts, each right hand component of the tens and higher subproducts is added to the left hand component of the next lower subproduct to obtain the related result digit and in some cases there is a tens carry which will increasethe result digit by 1.

In the apparatus of the invention, a circuit network is provided which isy initially adjusted in accordance with a given number and such adjustment will establish circuit paths representative of the sum of the several subproducts to obtain their sum (with .each left hand digity Thus, for the example` a digit, so that such product represents the sum of `the several subproducts, without tens carries, and that the network is then readjusted .to include such tens carries to represent the complete product.

In carrying out the objects of the invention, there is provided a separate network for each of the multiplier digits 1 to 9 and the setting rup of an amount will concurrently adjust all theV networks to establish in each the related product without carries. The carry readjustment is then effected concurrently for each network so all complete products become available for reading out.

Other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings, which disclose, by way of example, the principle of the invention and the best mode, which has been contemplated, of applying that principle.

In the drawings:

Fig. 1 is a diagrammatic View showing the general arrangement of the apparatus.

Fig. 2 is a detail in isometric of one order .of

' the amount setup device. l

Figs. 3, 3a, 319,30, Sd, 3e, 3f and 3g taken together and arrangedvertically in the order named constitute a wiring diagram of the `electrical circuits of the apparatus.

In Fig. 1 is shown diagrammatioally the general arrangement of the apparatus in Which-nine oblique blocks designated Xl to X9 each represents a Dart of the apparatuscontaining aoircuit network appropriate to the multiplying of an amount by a related digit 1 to 9. These blocks are subdivided into `horizontal denominational orders lthrough each of which there extends a'shaft It] having ,a gear or Wheel Il or other rotating device on its end, through which the shaft may be rotatively positioned to represent a digit of an amount. Y

Fig. 2 shows oneof the shafts it which has secured thereto and insulated therefrom a series'of double contact brushes or wipers l2 each in contacting engagement with an arcuate conductor I3 and one of a, ring of ten contact segments I4,

there being a segment for each of the digits to 9. The brushes I2 and like valued segments I 4 are al1 in axial alignment, so that when wheel II is turned all the brushes move in unison to connect the conductors I3 to the same line of segments I4. Thus, in Fig. 2 brushes I2 are set to all contact their related 2 segments I4.

In the operation of the apparatus, wheels II are set to represent an amount, for example 676, and then a carry readjustment is eiected, as will be explained in connection with the circuit diagram, following which the separate oblique sections of the apparatus will have their related networks set to represent the nine values indicated as 676 for 1 times 676, 1352 for 2 times 676, 2028 for 3 times 676, 2704 for 4 times 676, etc.

A distributor or emitter E is provided with an arcuate conductor I5 connected to a positive side of a current source. Ten segments IS are traversed4 by brush I7, so that current impulses are successively transmitted through wires I8 enclosed in a cable I9 to each of the nine networks.

Magnets 28 represent controlling magnets of a well known adding mechanism, which are responsive to differentially timed impulses sent thereto during a cycle of operation of the adding mechanism to enter therein a digit value. Brush I1 of emitter E is geared to the adding mechanism and rotated therewith, so that brush Il contacts the segments I6 in the order 9, 8, 7, 6, etc. at times appropriate to the entry of corresponding digits into the adding mechanism. These impulses pass through the computing networks to readout contact points 2i which may be selectively connected to contact points 22, so that the impulses are directed through wires 23 to column shift contacts 24, 25, and thence to adding magnets 2B. If, for example, it is desired to multiply 676 by 843, the operation is as follows. After wheels II are set at 676 and the circuits have been adjusted for carries, contacts 2l, 22 in the X3 section are closed and the emitter E rotated a half revolution to complete circuits representing 2028 to the four upper magnets 20. Contacts 25 are then shifted up one step, contacts 2l, 22 in the X4 section are then closed and emitter E again rotated to complete circuits representing 2704 to the magnets with a column shift of one place. Next, contacts are shifted up another step, contacts 21, 22 in the X8 section are closed, and emitter E again rotated to complete circuits representing 5408 to the magnets with column shift. This results in the addition of to obtain 569,868, the product of 676 times 843. The adding and column shift mechanism are not shown in detail as the invention primarily concerns the apparatus for forming the series of -1 to 9 multiples of a number and making them available at contacts 2| from which point connections may be made to magnets for controlling other similar dierentially controlled devices.

1X multiple In Fig. 3 the contact segments I4 are diagrammatically represented in a straight line and the brushes are set to represent the number 676. Since the reading out of 1 times a number in- 4 Volves no tens carry, the readout is direct. Emitter E transmits impulses from the plus side of current source to a group of lines I8 from which wires 30 extend to correspondingly numbered segments I4 in the three orders shown so that, when brush II engages the 9 segment I6, current is sent to all 9 segments I4. When brush I'I engages the 8 segment IB, current is sent to all 8 segments I4. When brush I1 engages the 7 segment I6, current is sent to all 7 segments I4 and in the tens order it continues through brush I2 (set at 7) to its conductor I3, and thence through a wire 3l to contacts 2l, 22 (previously closed) to energize magnet 28 in the tens order at the 7 time to enter a 7 in the adding device.

2X multiple In the X2 section of Fig. 3, the units order is provided with two brushes I2 and related segments I4 and conductors I3. The tens and hundreds orders are provided with three. It is to be noted that in multiplying any number by 2 there is never a tens carry required, so for this multiple the readout is direct without any readjustment of circuits after brushes I2 are set to represent a number (as 676, for example). The right hand set of segments I4 of the X2 multiple designated S0 are connected by a set of Wires 32 to lines I8 in accordance with the right hand digit of twice the value of the segment. Thus, the 1 and 6 segments are connected to the 2 wire I8, the 2 and 7 segments are connected to the 4 wire I8, the 3 and 8 segments are connected to the 6 wire I9, the 4 and 9 segments are connected to the 8 wire I8 and the 5 and 0 segments are connected to the 0 wire I8.

The central set of segments I4 in the tens and hundreds orders designated SI are connected to lines IB in accordance with a value one unit higher than for the corresponding segment in the right hand column SI).

Thus, the 0 and 5 segments are connected to the 1 wire I8, the 1 and 6 segments are connected to the 3 wire I8, the 2 and 7 segments are connected to the 5 wire I8, the 3 and 8 segments are connected to the 7 wire I8, and the 4 and 9 segments to the 9 wire I8.

In each order the segments I4 in the left hand columns designated C0 are wired together in the 0 to 4 positions and through the 0 wire 33 to the right hand or S0 contacts in the higher order. The segments 5 to 9 are also wired together and connected through the 1 wire 33 to the middle or SI conductor of the higher order. In the highest order the 0 and 1 wires 33 connect directly to the 0 and 1 Wires I8, respectively.

With this wiring arrangement, impulses from emitter E will flow through the network to directly energize magnets 20 in accordance with the product 1352, the circuits involved being emphasized in heavy lines. It is to be noted that in adding the subproducts obtained in multiplying any number by 2, no tens carries are involved and that the network constitutes an adding chain for summing up the subproducts with the denominational oiset in the order `The; circuityfor; the thousands order. extends fromthe 1 line- I8, @segment I4 of thehundreds order, brush I2; conductorv I3, wire 35 contacts 2.I 2.2, to the thousands magnet 20. The circuit for thev hundreds order extends from the 3 line I.8, 6; segment in the hundredsv order,L 1k wire 33 to theVsegment in the tens order, brush 12, cond uctor l:3;l and wire 36 tothe hundreds magnet `2li; The circuit for the tens order extendsfrom the-line1 E31, '7` segment of the middle tens section-SI, brush I2, conductor I3, 1 wire 33, brush I2; set at 6- inthe units section and Wire lto theiltenssegment 20. The units circuit'isdirectly through'theright handbrush I2iset at ffrom the 2;line IlhthroughV a Wire` 32,V and wire 38 `to thel units magnet 2U.

YAnalyzing the arrangement, the right hand order- Which, as noted, rconnect respectively tov lines larepresenting. the units digits of the tens subproduct (14) or one unit. higher (5) which are the twopossible sums of the units order left hand component 0 or 1, and'the tens order right 'handcomponent 4.

' Likewisetheleft hand tens brushrsetting co'nnects the .hundreds magnet 2@ toeither the first for secondbrush setting inthe hundreds order connecting respectively to lines i8v representing the units digits ofl the hundredsv subproduct (12) or one unit higher (3) which lare the two possiblesums of the tens order lefthand component' 0, or 1-.andf the hundreds order right hand component 2. The left hand componentofthe hundreds subproduct (12) is a direct readout through Wire`35-to the thousands magnet 20.

This circuit network may be dened, whenad?v justed, to represent any number as being arranged in accordancewith the table of addition. of the subproducts .of the number timesthe digit 2, inoffsetalignment, to produce the product oithe number times 2. Or it may be defined as being arranged to select from a seriesof. digit representing impulses or lines the ones repre-A,

senting the values of the product digitsin respense toa setting of a number and the operationk of" emitter E.

3X multiple Fig. 3a shows the circuit network arrangement for obtaining the 3 times multiple.

either 0, 1 or 2 and, as noted in the units order, thesegments I are connected in the 0 to 3 brush positions to the 0 wire 33, in the 4 to 6 brush positionsto the 1 wire 3,3, and in the? to .9.brush positions to the 2 wire 33'. Likewise, in higher orders the same grouping and connections to 0,- 1

or 2` wiresl 33 prevails. In all orders, theright hand set of segments I4 connected to wires IS representsthe right hand components of 3 times allthe digitsfor direct reading out if the lower subproduct has no signiicantr left hand component.

a second Yand third readout section whose segments connect to lines la'one and two units high er, respectively, thanthe corresponding segments It; ofthe right hand sections. K

For convenience. in explaining the operation,

When multiplying by 3 all' left hand'subproduct digits willjbe In thetehfsand higher order there are provided.

6. the readout Sectonsare identedas., Sil; Sl.p and; S2 for each order, tolrepresent the selection of; Safor controlling the readout circuit foran order when the lower order has a 0 left hand component. Si. controls when the lower order hasv a 1- left hand component, and-SZgcontrols when the lower order has a 2 left hand component.

The readout sections controlling the selection of the 0, 1 and 2 wires 33 are identified as Cl'i,l` and this section controls or directs the readout circuit when there is a no tens carry out of the.; related order. nated CI is provided,v in the tensA and hundreds-- order which, as will presentlyl be explained; con-f. trols the circuit when there is a tens carry out.V if therelated order.

It Willjrst be noted tllatv in addingl the sub,.- productsthe tens carry between orders` isV either O or 1, and that for the 3 times multiple the` carry,A of 1 can occ-ur only, Whena higher order brush I2 is set at either 3 or, 6, that is, in positions Where a 9 or an 8 might be read `out and to which a 1 or a 2 might be added.

The operation may best 1,be explained by considering the example 676 times, with the brushes i2 set to represent the number. After the brushes are set, as explained, switch 42 is shifted to its dotted line position to shift contacts 4!) and 43 andclcse conta-,cts lid-. This shift willlcause circuits to be completedto carry relaymagnets R related to ordersY from. which a unit isv to beV` carried. Thus, for'the example a unit is to be carried from the hundreds to the. thousands order, so the magnet R in thehundredsorder .is to beenergized. The circuit therefore.

is traceable from plus rside of current source through contacts 44, middle contacts 53; (shifted) wire 3,6, u contacts of magnet R of the tens order (normal), conductor I3 of section Cil, brush, I (set at 7)., 2 wire 33 to conductor I3,I of section S2 in the hundreds order, brush I?.l (set ate), contacts I (shifted) and magnet R in the hun; dreds order to ground. -Magnet R: will shift` its a and b contacts, the latter providing a holding circuit through switch 45, which is closed shortly after switch 42 is closed. Next, switch 42 is reopened and the emitter is operated to causethe true product to read out.

The sequential operation of switches Ll?, i5 and emitter E is described as being manual for sim-- pli-city, but it will be understood that suitablev timing devices may be employed to eiiect their operation.

When emitter yE now operates, the heal/,y line,l circuits will be completed to enter the product 2028 into magnets 20. In the units order this circuit is traceable from the 8 line i8, through brush I2 in-section S0 of the units order and wire 38 to the units magnet 20.

In the tens order the circuit is traceable from the 2 line I8, brush I2 in section SI of the tens order,r 1l wire 33to brush. I2 ink section CD of the unitsorder, wire 3'? and contacts i3 (normal.) to@ the tens magnet 20.

Inthe hundreds order, the circuit istraceable from the 0' line i8, contacts 'it (normal) brushJI-z.,

Arvfurther readout sectiondesigf in section S2, 2 Wire 33, brush I2 in section C0 of the tens order, a contacts of magnet R (normal), wire 36, contacts 43 (normal) to the hundreds magnet 2 0.

In the thousands order the circuit is traceable from the 2 line I8, brush I2 in section CI of the hundreds order, a contacts of magnet R (shifted), wire 35 and contacts 43 to the hundreds magnet 20.

It will be noted that the circuit to the thousands magnet 23 is initially routed from the 1 wire I3, through section C of the hundreds order and that upon the carry adjustment the routing is shifted to run from the 2 wire I8, through section CI.

To illustrate the condition wherein a so-called carry on carry is involved, let us consider the example of 3 times 669 which gives the following subproducts:

It will .be noted that the summation requires a tens carry from the tens to the hundreds order, which added to the sum of 8 and l in the hundreds order requires a carry from such hundreds order to the thousands order. Under these conditions, the magnets R in both the tens and hundreds orders Will be initially energized when switch 42 is operated. The circuit for the tens order is traceable from plus side of current source, through contacts 44, lowest contacts 43 (shifted), Wire 31, conductor I3 in the units order of section C0, brush I2 (set at 9), the 2 Wire 33 to conductor I3 0f section S2 in the tens order, brush I2 (set at 6), contacts 40 (shifted), and magnet R, in the tens order to ground. Its a and b contacts accordingly shift and remain so When switch 45 is closed.

For the hundreds order, the circuit is traceable from plus side of current source, through contacts 44, middle contacts 43 (shifted), wire 36, a contacts of magnet R of the tens order (shifted), conductor I3 of section CI, brush I2 (set at 6), 2 wire 33 to conductor I3 of section S2 in the hundreds order, brush I2 (set at 6), contacts 40 (shifted), and magnet R in the hundreds order to ground.

When switch 42 is reopened, the emitter is operated and the complete product 2007 will be read out through readily traceable circuits. It will be noted that the initial tens carry test and setup takes into account the so-called carry-on-carry conditions and will energize magnets R associated with those orders from which a unit is to be carfied, whether the carry is a so-called direct carry or a carry on a carry.

4X multiple The circuits for this multiple are shown in Fig. 3b. Since the maximum value of left handcomponent digits is 3, thereis provided in each order higher than units four readout sections S, SI, S2 and S3 wired to progressively higher valued lines4 I8 with section S0 wired in accordance With the values of the right hand component digits. The C0 sections have four segment groupings extending to four wires 33 following the principles explained in connection with the X3 readout.

Brushes I2 are set at 616 and, when switch 42 (which may be the same switch as in Fig. 3a or connected thereto for concurrent operation) .is shifted, magnet R. in the tens order will be energized, since a carry is to take place from the tens order in accordance with the principles set forth. The energizing circuit is traceable from the plus side of current source, contacts 44, contacts 43, Wire 31, brush I2 in section C0 of the units order (set at 6), 2 wire 33, brush I2 in the S2 section of the tens order (set at 7), contacts 40 (shifted) and magnet R in the tens order to ground. Closure of switch 45 will establish the holding circuit, and with switch 42 reopened and emitter E operated the circuits emphasized in heavy lines Will be completed to enter the product 2704 into magnets 20. It is believed the emphasized circuits are sufficiently clear in designating the several current paths, so that specic tracing thereof is not given here.

5X multiple The circuits for this multiple are shown in Fig. 3c. Since the maximum value of left hand component digits is 4, there is provided in each order higher than units five readout sections S0, SI, S2, S3 and S4 wired to progressively higher valued lines I8 with section S0 wired to the 0 and 5 lines, since these are the only right hand component digits than can occur when multiplying by 5.

The C0 sections have live segment groupings extending to five wires 33 following the principles explained. v

It will .be particularly noted that, when multiplying by 5, there will be no tens carries so that for this multiple, as for the 2 times multiple, no CI sections need be provided and incident1y no readjustment of the network is required. Thus, upon setting of the number 676 and operation of emitter E the circuits will be completed to enter the product 3380 directly into magnets 20.

6X multiple The circuits for this multiple are shown in Fig. 3d. Since the maximum value of left hand component digits is`5, there is provided in each order higher than units six readout sections Sil, SI to S5 wired to progressively higher valued lines I8 with sections SD wired in accordance with the values of the right hand component digits. The CD sections have six segment groupings extending to six wires 33 numbered 0 to 5 following the principles explained.

With brushes I2 set to represent 676 as before, closure of switch 42 will result in energization of magnet R in the hundreds order, since a carry is required out of this order. The energizing circuit is traceable from the plus side of current source, contacts 44, contacts 43, wire 35, a contacts of magnet R in the tens order (normal), brush l2 in the C0 section of the tens order, 4 wire 33, brush I2 in the S4 section of the hundreds order (set at 7), contacts 40 (shifted) and magnet R. in the hundreds order to ground.

Closure of switch 45 will establish the holding circuit and with switch 42 reopened and emitter E operated the circuits emphasized in heavy lines will be completed to energize magnets 20 in accordance with the product 4056.

7X multiple The circuits for this multiple are shown in Fig. 3e. Since the maximum value of the, left hand component digit is 6, there is provided in `1each order lhigher A'than units seven `readout sections-S', `'SI to Sdwired-in "the progressive `manner explained, 7-with section 5SH wired in accordance with A=the valuesof 'the 1 righthandl component-tligits. The Cil 's'ectionshave'seven segment groupings extending to seven wireslsnumbored to f 6 in vaccordance fwith 3the principles explained.

vWith brushes -I2 setto represent' as belfore, closure-of switch `f42 will result in energization of magnetiR in 'thetens-order,sincea'carry is required -out of ythis forder. llhe energizing circuit lis traceablefromthe plusside of current lsource 314, vcontacts 413, wire31, brush I2 in the C0 section ofthe units'order `(set at i6), 4 `wire 33, brush I2 linthem-'section of the tens order, contacts 40 and magnet R; in the tens order to ground. Closure of switch-45 will establish the xholding circuit and withfswitch 42 reopened 'and emitter E operated the circuits *emphasized in heavy lines will Ibo completed to energize magnet 20 in accordance with the product 4732.

A8X multiple The circuits for this multiple yare shown in Fig. 3f. In accordance with the principles laid down, there are provided eight sections SIl, SI .toS'I in the higher orders `with the segments I4 of section C@ grouped to connect through eight wires 33 to the S sections of higher orders.

With brushes I2 set to represent 676 as before, closure of contacts 42 will result in energization of magnets R in both the tens and hundreds sections, ksincethere is a carry required out of .both of these orders. For the tens order, the circuit is traceable from plus side of course, contacts vIUI, '43, wire 38, brush I2 in section'S of the units order (set at 6), 4 wire 33, brush I2 in section S4 ofthe tens order, contacts 4I! and magnet'R in the tens order to ground.

lFor the hundreds order, the circuit is traceable from the plus side of source, contacts M, 43,

wire 36, a contacts of magnet R (normal), brush y I2 in section CI of the tens order, 5 wire 33, brush I2 vin section S5 of the hundreds order, contacts 4Q, and magnet R in the hundreds order to ground. Closure of switch will establish the holding circuits and with switch d2 reopened and emitter E operatedthe circuits emphasized in heavy lines will be completed to energize magnets il@ in accordance with the product 5408.

9X 'multiple The circuits for this multiple are shown in Fig. 3g, where sections S0, SI' to S8 are provided and ten wires 33 between orders. In the now familiar manner, when switch 42 is closed, magnet R in the hundreds order will be picked up for the problem 676 9, and thereafter circuits emphasized in heavy lines willbe completed to energize magnets 2li in accordance with the product 6084. l

Accordingly, the setting up of a multiplicand concurrently to a plurality of banks. lThesey magnets *may control known devices such vas adding, printing or comparing devices, as may be consistent with "the procedure contemplated.

While there have been shown and described and pointed out the `fundamental novel features of the invention as'applied to a single modication, it will be :understood 'that vvarious omissions and substitutions and changes inthe'form and detailsoi the device villus'tra'ted'and linits operation may be madebyithoseskilled inthe artwith'out departing fromithefspiritof the invention. It is fthe intention'there'foretobe limited only as indicated by the scope of :the 'following claims.

vXlvhat'is claimed is:

51.'."In .a 'machine of the class de-scribed, an entrysfeceivngandretainingdevice comprising a seto'f similar y'donominationally ordered elements fsettable' 'to' represent imultidenominational number, a set 'of kdenoinitiationally iorder'ed magnets, an emitter for 'emitting a 7single 'group-of timedirnpulses, one impulse for each fof itheidigits 1 to '9, means controlled `by `said 'elements for :initially-'selecting:and making effective for lconttrol of said I'magnets1only, the impulses Ico-rrespondingto the product without .tens carries of thenumbe'r represented bythe elements times a predetermined digit, and carry determining `means .controlled iby the 'elements for ascertaining the tens carry requirements and for changing said initial selection to render the selecting means effective to select the impulses corresponding to the product, including tens carries.

2. In an apparatus of the class described, a series of current lines, one for each of the digits 1 to 9, a plurality of denominationally ordered magnets, a plurality of denominationally ordered sets of difterentially positionable contact elements, settable to represent a multiplicand amount, the element in the units set upon positioning thereof eiecting a separate electrical connection between a line representing the right hand component of the units multiplicand digit times 3 and the units magnet, the lelement in the tens set jointly with the element in the units set eiecting a second electrical connection between a line representing the sum of the right hand component of the tens multiplicand digit times 3' plus the left hand component of the units multiplicand digit times 3, and the tens magnet, and means for sending current through said lines to energize the magnets' through the said connections.

3. In an apparatus of the class described, a

- series of current lines, one for each of the digits 1 to 9, a yplurality of denominationally ordered magnets, a plurality of denominationally ordered sets of differentially positionable contact elements, settable to representv a multiplicand amount, the element in the units set upon positioning thereof eiecting a separate electrical Y connection between a line representing the right amount will condition. or adjust separate circuits hand component of the units multiplicand` digit times 3 and the units magnet, the element in the tens set jointly with the element in the units set effecting a second electrical connection between a line representing the sum of the right hand component of the tens multiplicand digit times 3 plusy the left hand component of the units multiplicand digit times 3 and the tens magnet, the element in the hundreds set jointly with the element in the tens set effecting a third electricalk connection between a line representing the sum of the right hand component of the hundreds multiplicand digit times 3 plus the left hand component of the tens muliplicand digit times 3 and the hundreds magnet, a carry magnet for each set of elements, means including part of said second connection for energizing the related carry magnet when said sum is or more, means controlled *by the energized magnet for changing the third connection to a line one digit higher in value, and means :for sending current through said lines to energize the magnets through the said connections.

4. In an apparatus of the class described, a series of current lines, one l:for each of the digits 1 to 9, a yplurality of denominationally ordered magnets, a plurality of denominationally ordered sets of differentially positionable contact elements, settable to represent a multiplicand amount, the element in the units set upon positioning thereof effecting a separate electrical connection between a line representing the right hand component of the units multiplicand digit times a predetermined digit and the units magnet, the element in the tens set jointly with the element in the units set effecting a second electrical connection between a line representing the sum of the right hand component of the tens multiplicand digit times said predetermined digit plus the left hand component of the units multiplicand digit times said predetermined digit and the tens magnet, the element in the hundreds set 12 jointly With the element in the tens set effecting a third electrical connection between a line representing the sum of the right hand component of the hundreds multiplicand digit times said predetermined digit plus the left hand component of the tens multiplicand digit times said predetermined digit and the hundreds magnet, a carry magnet for each set of elements, means including part of said second connection for venergizing its related carry magnet When said sum is 10 or more, means controlled tby the energized carry magnet for changing the third connection to a line one digit higher in Value, and means for sending current through said lines to energize the magnets through the said connections.

MARCEL SENS-OLIVE- REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,199,537 Campbell May 7, 1940 2,332,304 Davies Oct. 19, 1943 FOREIGN PATENTS Number Country Date 456,368 Great Britain Nov. 9, 1936 

